Substrate for medical device and medical device

ABSTRACT

A substrate for a medical device, a portion of which is brought into contact with or inserted into a subject. The substrate includes a patient circuit conductively connected to the portion that is configured to be brought into contact with or inserted into the subject, and a ground-side circuit configured to perform at least one of transmission of a signal, reception of a signal, and supply of electric power on the patient circuit. The ground-side circuit is grounded by a protective ground to ensure safety of a manipulator of the medical device. The substrate also includes an insulating layer between the patient circuit and the ground-side circuit providing insulation between the patient circuit and the ground-side circuit, and an isolated circuit provided apart from the patient circuit and the ground-side circuit on the insulating layer and having a different reference potential from the patient circuit and the ground-side circuit.

TECHNICAL FIELD

The present disclosure relates to a substrate for a medical device thatis included in a medical device at least part of which is brought intocontact with or inserted into a subject such as a person and a medicaldevice.

BACKGROUND ART

Thus far, as medical devices at least part of which is brought intocontact with or inserted into a subject such as a person, an endoscopesystem that observes the subject, an ultrasonic observation systemincluding an ultrasonic endoscope system using ultrasonic waves, atreatment device system that applies energy to the subject, etc. havebeen commonly known. The medical device generally includes a patientcircuit that is a circuit on the side of being brought into contact withor inserted into the subject and a ground-side circuit that is a circuitprovided on the side of performing the transmission and reception ofsignals, the supply of electric power, etc. with the patient circuit andgrounded by functional grounding, protective grounding for ensuring thesafety of the manipulator of the medical device, or the like, such asthe primary circuit and the secondary circuit. In such a medical device,electrical insulation is provided between the patient circuit and theground-side circuit in order to ensure safety.

For the medical device, there is known a technology in which thereference potential of the patient circuit (the patient ground) and thereference potential of the ground-side circuit are connected by animpedance element such as a capacitor in an alternating current manner,and thereby the reference potential of the patient circuit is stabilizedand the noise between the patient circuit and the ground-side circuit isreduced (e.g. see Patent Literature 1).

CITATION LIST Patent Literature

Patent Literature 1: JP 2000-279381A

DISCLOSURE OF INVENTION Technical Problem

In the case where, in a substrate for a medical device that includes thepatient circuit and the ground-side circuit described above and in whichthe patient circuit and the ground-side circuit are connected by animpedance element, a capacitor is used as the impedance element, acapacitor of a dual inline package (DIP) type is generally used.However, in the patient circuit and the ground-side circuit of recentyears, the proportion of, for example, electronic components of what iscalled a chip type such as a surface-mount device (SMD) type is large,and consequently a mounting process other than that for the chip-typeelectronic components has been needed in order to mount the DIP-typecapacitor on the same substrate.

To solve the problem, it may be possible to use a chip-type ceramiccapacitor as the impedance element. However, although a desiredbreakdown voltage capacity can be provided, a single-body large-sizedceramic capacitor by which the patient circuit and the ground-sidecircuit can be connected while a creeping distance of, for example,approximately 8 mm is ensured as the insulation distance between thepatient circuit and the ground-side circuit may experience the crackingof the ceramic or the like, and the manufacturing has been technicallydifficult.

The present disclosure has been made in view of the above, and an objectof the present disclosure is to provide a substrate for a medical deviceand a medical device in which the reference potential of the patientcircuit can be stabilized, the noise between the patient circuit and theground-side circuit can be reduced, and the insulation distance betweenthe patient circuit and the ground-side circuit can be sufficientlyensured without using a large-sized electronic component.

Solution to Problem

In order to solve the above problem and achieve the object, a substratefor a medical device according to the present disclosure is configuredto be included in a medical device at least part of which is broughtinto contact with or inserted into a subject, the substrate for amedical device including: a patient circuit that is a circuit on a sideof being brought into contact with or inserted into the subject; aground-side circuit that is a circuit configured to perform at least oneof transmission of a signal, reception of a signal, and supply ofelectric power on the patient circuit and grounded; an insulating layerprovided between the patient circuit and the ground-side circuit andproviding insulation between the patient circuit and the ground-sidecircuit; and an isolated circuit provided apart from the patient circuitand the ground-side circuit on the insulating layer and having adifferent reference potential from the patient circuit and theground-side circuit.

The substrate for a medical device according to the present disclosure,in the above invention, may further include a plurality of impedancemeans for connecting either one of the patient circuit and theground-side circuit and the isolated circuit. The patient circuit andthe ground-side circuit may be connected via the isolated circuit and atleast part of the plurality of impedance means.

In the substrate for a medical device according to the presentdisclosure, in the above invention, the isolated circuit and theimpedance means may be located on at least one of a first surface and asecond surface that are surfaces in a thickness direction of thesubstrate for a medical device and an inner layer.

The substrate for a medical device according to the present disclosure,in the above invention, may further include: a plurality of the isolatedcircuits; and an impedance means for connecting two of the plurality ofisolated circuits.

In the substrate for a medical device according to the presentdisclosure, in the above invention, the impedance means may be formed ofa chip-type electronic component.

In the substrate for a medical device according to the presentdisclosure, in the above invention, the impedance means may be locatedon at least two of a first surface and a second surface that aresurfaces in a thickness direction of the substrate for a medical deviceand an inner layer, and may be provided such that at least part of theimpedance means overlap along the thickness direction of the substratefor a medical device.

The substrate for a medical device according to the present disclosure,in the above invention, may include a conduction fixing portion providedin the ground-side circuit and fixed in the medical device while beingconnected with conduction to a ground-side circuit or a grounding unitprovided in the medical device and yet outside the substrate for amedical device.

A medical device according to the present disclosure, at least part ofwhich is brought into contact with or inserted into a subject, includesa substrate for a medical device. The substrate for a medical deviceincludes a patient circuit that is a circuit on a side of being broughtinto contact with or inserted into the subject, a ground-side circuitthat is a circuit configured to perform at least one of transmission ofa signal, reception of a signal, and supply of electric power on thepatient circuit and grounded, an insulating layer provided between thepatient circuit and the ground-side circuit and providing insulationbetween the patient circuit and the ground-side circuit, and an isolatedcircuit provided apart from the patient circuit and the ground-sidecircuit on the insulating layer and having a different referencepotential from the patient circuit and the ground-side circuit.

The medical device according to the present disclosure, in the aboveinvention, may include: a tip device including a circuit unit connectedwith conduction to the patient circuit and being configured to bebrought into contact with or inserted into the subject; and a controldevice including the substrate for a medical device and being configuredto control operation of the tip device.

The medical device according to the present disclosure, in the aboveinvention, may further include an electrically conductive fixing meansfor fixing the substrate for a medical device in the medical device. Theground-side circuit may be grounded via the fixing means.

Advantageous Effects of Invention

According to the present disclosure, an isolated circuit that isprovided away from the patient circuit and the ground-side circuit onthe insulating layer between the patient circuit and the ground-sidecircuit and has a different reference potential from the patient circuitand the ground-side circuit is included; therefore, the referencepotential of the patient circuit can be stabilized, the noise betweenthe patient circuit and the ground-side circuit can be reduced, and theinsulation distance between the patient circuit and the ground-sidecircuit can be sufficiently ensured without using a large-sizedelectronic component.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram showing a rough configuration of an endoscope systemthat is a medical device according to an embodiment of the presentdisclosure.

FIG. 2 is a plan view showing the configuration of a substrate for amedical device according to an embodiment of the present disclosure.

FIG. 3 is a plan view showing the configuration of a substrate for amedical device according to Modification Example 1 of an embodiment ofthe present disclosure.

FIG. 4 is a plan view showing the configuration of a substrate for amedical device according to Modification Example 2 of an embodiment ofthe present disclosure.

FIG. 5 is a cross-sectional view showing the configuration of a mainpart of a substrate for a medical device according to ModificationExample 3 of an embodiment of the present disclosure.

FIG. 6 is a cross-sectional view showing the configuration of a mainpart of a substrate for a medical device according to ModificationExample 4 of an embodiment of the present disclosure.

FIG. 7 is a plan view showing the configuration of a main part of asubstrate for a medical device according to Modification Example 5 of anembodiment of the present disclosure.

FIG. 8 is a plan view showing the configuration of a main part of asubstrate for a medical device according to Modification Example 6 of anembodiment of the present disclosure.

FIG. 9 is a plan view showing the configuration of a substrate for amedical device according to another embodiment.

MODE(S) FOR CARRYING OUT THE INVENTION

Hereinbelow, embodiments of the present disclosure (hereinafter,referred to as “embodiments”) are described with reference to theappended drawings. The drawings are only schematic ones, and portionsfor which the relationships between dimensions and the proportions aredifferent among drawings may be included in the drawings.

FIG. 1 is a diagram showing a rough configuration of an endoscope systemthat is a medical device according to an embodiment of the presentdisclosure. An endoscope system 1 shown in the drawing is a device thatobserves the interior of a subject such as a person. The endoscopesystem 1 includes an endoscope 2 that captures an image of the interiorof the subject by inserting its tip into the interior of the subject, acontrol device 3 that performs a prescribed image processing on an imageof the interior of a body captured by the endoscope 2 to create imagedata for display and comprehensively controls the operation of theentire endoscope system 1, a light source device 4 that generatesillumination light that is applied to the subject from the tip of theendoscope 2, and a display device 5 that includes a liquid crystaldisplay panel or an organic electro-luminescence (EL) display panel anddisplays an image.

The endoscope 2 includes an insertion unit 21 that is rigid and has along, thin shape and of which the tip is inserted into the interior ofthe subject, a camera head 22 that is connected to the root end of theinsertion unit 21 in an attachable and detachable manner, and capturesan image of the subject optically collected via the insertion unit 21and outputs an imaging signal, a transmission cable 23 that transmits animaging signal outputted by the camera head 22 to the control device 3,a connector 24 that is provided at the root end of the transmissioncable 23 and is mounted on the control device 3 in an attachable anddetachable manner, and a light guide 25 that transmits the illuminationlight generated by the light source device 4 to the tip of the insertionunit 21.

The insertion unit 21 includes a light collection optical system that isprovided inside an outer casing having a cylindrical shape and collectslight from the subject and an illumination optical system that isprovided inside the outer casing and applies the illumination lighttransmitted from the light source device 4 via the light guide 25 to thesubject. The light collection optical system and the illuminationoptical system are each configured using one or a plurality of lenses.

The camera head 22 includes an imaging element that photoelectricallyconverts the light collected by the optical system of the insertion unit21 to generate an imaging signal and an input unit that accepts theinput of an operation instruction signal of the endoscope 2. The imagingelement is configured using an image sensor such as a charge-coupleddevice (CCD) or a complementary metal oxide semiconductor (CMOS).

The endoscope 2 having the above configuration includes a circuit unitconnected with conduction to a patient circuit 7 included in a substratefor a medical device 6 described later, and has a function as a tipdevice that acquires the information of the subject.

Although the case where the endoscope 2 is a rigid endoscope isdescribed in the embodiment, the present disclosure can be applied alsoto an endoscope system including a flexible endoscope or an ultrasonicendoscope, as a matter of course.

The control device 3 is a camera control unit that performs a prescribedsignal processing on an imaging signal generated by the endoscope 2 tocreate image data of the subject. The control device 3 is configuredusing a central processing unit (CPU) etc.

The control device 3 includes a substrate for a medical device(hereinafter, simply referred to as a substrate) 6 that includes apatient circuit connected with conduction to the circuit unit of theendoscope 2 and a ground-side circuit that is a circuit that is groundedwhile being insulated from the patient circuit. The ground-side circuitis, for example, a circuit grounded by functional grounding, protectivegrounding for ensuring the safety of the manipulator of the endoscopesystem 1, or the like. More specifically, the ground-side circuit is,for example, the primary circuit that is grounded while being connectedto a commercial power source and the secondary circuit insulated fromthe primary circuit.

Although the case where the control device 3 is a camera control unit isdescribed in the embodiment, the present disclosure can be applied toany medical device for an endoscope system including a patient circuitand a ground-side circuit, such as a light source device that suppliesillumination light to the endoscope 2 or a fluid supply device thatsupplies a fluid such as a gas or a liquid to the endoscope 2, as amatter of course. Further, although the case where the endoscope 2 andthe control device 3 are separate devices is described in theembodiment, the present disclosure can be applied also to an endoscopedevice in which they are integrally provided, as a matter of course.

The configuration of the substrate 6 will now be described withreference to the plan view shown in FIG. 2. The substrate 6 shown inFIG. 2 includes a patient circuit 7, three ground-side circuits 8 a, 8b, and 8 c, and insulating layers 9 a, 9 b, and 9 c formed between thepatient circuit 7 and the ground-side circuits 8 a, 8 b, and 8 c,respectively, and the major surface of the substrate 6 has a rectangularshape.

The patient circuit 7 is located in a central portion of the substrate6, and has a T-shaped configuration. In FIG. 2, the patient circuit 7 isin a state of being laid horizontally, with the upper side of the Tshape located on the right side of the drawing. The ground-side circuits8 a and 8 b in a rectangular shape are provided on both sides of thevertical line of the T shape of the patient circuit 7 (in FIG. 2, aboveand below the vertical line of the T shape), respectively. Theground-side circuit 8 c in a rectangular shape that has a long sideequal in length to the horizontal line of the T shape is provided in aposition facing the horizontal line of the T shape of the patientcircuit 7 (in FIG. 2, on the right side of the horizontal line of the Tshape). Thus, any one of the ground-side circuits 8 a, 8 b, and 8 c islocated in each of the four corners (end portions) of the substrate 6.By placing the three ground-side circuits 8 a, 8 b, and 8 c in endportions of the substrate 6, the reference potential of the patientcircuit 7 (the patient ground) can be stabilized.

The vicinities of, among the vertices of the ground-side circuits 8 aand 8 b, the vertices not connected to either of the insulating layers 9a and 9 b have conduction fixing portions that are regions where holes81 a and 81 b through which a fixing screw that is a fixing means forfixing the substrate 6 to the casing of the control device 3 is insertedare formed, respectively. Also the vicinities of, among the vertices ofthe ground-side circuit 8 c, the two vertices not connected to theinsulating layer 9 c have conduction fixing portions that are regionswhere holes 81 c and 82 c through which a fixing screw is inserted areformed, respectively. The ground-side circuits 8 a, 8 b, and 8 c areprotectively grounded via the fixing screw and the casing.

The major surface of the insulating layer 9 a has a hook-like shape. Onthe surface of the insulating layer 9 a, an isolated circuit 31 that hasa major surface having a rectangular shape and has a different referencepotential from the patient circuit 7 and the ground-side circuit 8 a isprovided in a position apart from both of the patient circuit 7 and theground-side circuit 8 a. The isolated circuit 31 has at least aconduction pattern, and has a configuration in which an impedanceelement 51 described below and other various electronic components canbe mounted as necessary.

The patient circuit 7 and the isolated circuit 31 are connected via animpedance element 51. The ground-side circuit 8 a and the isolatedcircuit 31 are connected via an impedance element 52. That is, theimpedance elements 51 and 52 are connected in series via the isolatedcircuit 31.

The impedance elements 51 and 52 are formed of any of a capacitor, acoil, and a resistance, or an appropriate combination of them, and havea function as an impedance means. The impedance element 51 and theimpedance element 52 do not need to have the same configuration.

The impedance elements 51 and 52 may be either the DIP type or thesurface-mount type, and is preferably the surface-mount type becausethey can be mounted together with other surface-mount-type electroniccomponents that constitute the patient circuit 7 and the ground-sidecircuits 8 a, 8 b, and 8 c and the number of manufacturing steps can bereduced.

The impedance elements 51 and 52 preferably have a sufficient breakdownvoltage capacity not to cause breakdown even when an abnormal voltageoccurs and all the voltage is applied to either one.

Although an impedance element of a capacitor, a coil, or a resistance isused as the impedance means in the embodiment, the impedance element isnot limited to them, and a dielectric sheet or the like may be used.

The isolated circuits described below have at least a circuit patternsimilarly to the isolated circuit 31 described above. The impedanceelements described below are formed of any of a capacitor, a coil, and aresistance, or an appropriate combination of them, and have a functionas an impedance means, similarly to the impedance element 51 etc.described above. Further, the impedance elements described below have asimilar breakdown voltage capacity to the impedance element 51 etc.

The major surface of the insulating layer 9 b has a hook-like shape. Onthe surface of the insulating layer 9 b, an isolated circuit 32 that hasa major surface having a rectangular shape and has a different referencepotential from the patient circuit 7 and the ground-side circuit 8 b isprovided in a position apart from both of the patient circuit 7 and theground-side circuit 8 b. The patient circuit 7 and the isolated circuit32 are connected via an impedance element 53. The ground-side circuit 8b and the isolated circuit 32 are connected via an impedance element 54.That is, the impedance elements 53 and 54 are connected in series viathe isolated circuit 32.

The major surface of the insulating layer 9 c has a straight-lined bandshape. On the surface of the insulating layer 9 c, isolated circuits 33,34, and 35 that have a major surface having a rectangular shape and havea different reference potential from the patient circuit 7 and theground-side circuit 8 c are provided in positions apart from the patientcircuit 7 and the ground-side circuit 8 c. The patient circuit 7 and theisolated circuit 33 are connected via an impedance element 55. Theground-side circuit 8 c and the isolated circuit 33 are connected via animpedance element 56. The patient circuit 7 and the isolated circuit 34are connected via an impedance element 57. The ground-side circuit 8 cand the isolated circuit 34 are connected via an impedance element 58.The patient circuit 7 and the isolated circuit 35 are connected via anIC for isolation 59. The isolated circuit 35 and the ground-side circuit8 c are connected via an IC for isolation 60.

The impedance elements 51 to 58 are preferably placed in edge endportions of the substrate 6 as shown in FIG. 2. By placing the impedanceelements 51 to 58 in edge end portions of the substrate 6, the referencepotential of the patient circuit 7 can be stabilized more.

The substrate 6 having the above configuration may be a rigid substrate,a flexible substrate, or a rigid-flexible substrate.

In an embodiment of the present disclosure described above, an isolatedcircuit that is provided away from the patient circuit and theground-side circuit and has a different reference potential from thepatient circuit and the ground-side circuit is provided on the surfaceof the insulating layer between the patient circuit and the ground-sidecircuit, a plurality of impedance means for connecting either of thepatient circuit and the ground-side circuit and the isolated circuit areprovided, and the patient circuit and the ground-side circuit areconnected via the isolated circuit and at least part of the plurality ofimpedance means; therefore, the patient circuit and the ground-sidecircuit can be linked even in a case where an impedance means alonecould not link the patient circuit and the ground-side circuit, andthere is no need to increase the size of the impedance means. Thus, bythe embodiment, the reference potential of the patient circuit can bestabilized, the noise between the patient circuit and the ground-sidecircuit can be reduced, and the insulation distance between the patientcircuit and the ground-side circuit can be sufficiently ensured withoutusing a large-sized electronic component.

Furthermore, in the embodiment, since the impedance means is provided inan edge end portion of the substrate, the reference potential of thepatient circuit can be considerably stabilized.

The shape of the major surface of the isolated circuit may be a shapeother than a rectangular shape, such as a polygonal shape, a circularshape, or an elliptical shape. Further, the shape of the major surfaceof the isolated circuit may have a wavelike shape, or may have a shapein which the width changes on the way.

Although the case where the substrate 6 is provided in the controldevice 3 is described in the embodiment, the present disclosure can beapplied also to the case where the substrate 6 is provided in theendoscope 2, as a matter of course.

Modification Example 1

FIG. 3 is a plan view showing the configuration of a substrate accordingto Modification Example 1 of the embodiment. A substrate 10 shown in thedrawing differs from the substrate 6 described in Embodiment 1 in theconfiguration of the isolated circuit. The configuration of the isolatedcircuit of the substrate 10 will now be described.

On the surface of the insulating layer 9 a, an isolated circuit 36 thatis formed so as to connect two mutually orthogonal sides of thesubstrate 10 while running along the center in the width direction ofthe insulating layer 9 a, which has a major surface having a hook-likeshape, and has a major surface having a hook-like shape is provided. Thepatient circuit 7 and the isolated circuit 36 are connected via theimpedance element 51. The ground-side circuit 8 a and the isolatedcircuit 36 are connected via the impedance element 52.

On the surface of the insulating layer 9 b, an isolated circuit 37 thatis formed so as to connect two mutually orthogonal sides of thesubstrate 10 while running along the center in the width direction ofthe insulating layer 9 b, which has a major surface having a hook-likeshape, and has a major surface having a hook-like shape is provided. Thepatient circuit 7 and the isolated circuit 37 are connected via theimpedance element 53. The ground-side circuit 8 b and the isolatedcircuit 37 are connected via the impedance element 54.

On the surface of the insulating layer 9 c, an isolated circuit 38 thatis formed so as to connect two mutually facing sides of the substrate 10while running along the center in the band width direction of theinsulating layer 9 c, which has a band shape, and has a straight-linedband shape is provided. The patient circuit 7 and the isolated circuit38 are connected via the impedance elements 55 and 57 and the IC forisolation 59. The ground-side circuit 8 c and the isolated circuit 38are connected via the impedance elements 56 and 58 and the IC forisolation 60.

In Modification Example 1 of the embodiment described above, since theisolated circuit is formed so as to divide the major surface of theinsulating layer into two parts, the flexibility of selection andplacement of the impedance element can be enhanced.

Modification Example 2

FIG. 4 is a plan view showing the configuration of a substrate accordingto Modification Example 2 of the embodiment. A substrate 11 shown in thedrawing differs from the substrate 6 described in Embodiment 1 in theconfiguration of the isolated circuit provided on the insulating layer 9c between the patient circuit 7 and the ground-side circuit 8 c and theconfiguration of the impedance element connected to the isolatedcircuit. The configuration different from the substrate 6 out of theconfiguration of the substrate 11 will now be described.

On the surface of the insulating layer 9 c, isolated circuits 39 to 41are provided in addition to the isolated circuit 33. Of them, theisolated circuit 39 has a rectangular shape in which the longitudinaldirection of the insulating layer 9 c is taken as the long sidedirection, and the two impedance elements 57 and 58 and the two ICs forisolation 59 and 60 are connected to the isolated circuit 39. Thepatient circuit 7 and the isolated circuit 39 are connected via theimpedance element 57 and the IC for isolation 59. The ground-sidecircuit 8 c and the isolated circuit 39 are connected via the impedanceelement 58 and the IC for isolation 60.

The isolated circuit 40 is connected to the patient circuit 7 via animpedance element 61, and is connected to the ground-side circuit 8 cvia an impedance element 62. The isolated circuit 40 is connected to theisolated circuit 41 via an impedance element 63.

The isolated circuit 41 is connected to the patient circuit 7 via animpedance element 64.

In Modification Example 2 of the embodiment described above, theinsulation distance between the patient circuit and the ground-sidecircuit can be made still longer by connecting different isolatedcircuits by means of impedance elements.

Modification Example 3

FIG. 5 is a cross-sectional view showing the configuration of a mainpart of a substrate according to Modification Example 3 of theembodiment. A substrate 12 shown in the drawing includes a patientcircuit 13, a ground-side circuit 14, and an insulating layer 15provided between the patient circuit 13 and the ground-side circuit 14.On one surface of the insulating layer 15, an isolated circuit 42 isprovided in a position apart from the patient circuit 13 and theground-side circuit 14; on the other surface of the insulating layer 15,an isolated circuit 43 is provided in a position apart from the patientcircuit 13 and the ground-side circuit 14.

The patient circuit 13 and the isolated circuit 42 are connected via animpedance element 65. The ground-side circuit 14 and the isolatedcircuit 42 are connected via an impedance element 66. The patientcircuit 13 and the isolated circuit 43 are connected via an impedanceelement 67. The ground-side circuit 14 and the isolated circuit 43 areconnected via an impedance element 68. The impedance elements 65 to 68are surface-mount-type electronic components.

In Modification Example 3 of the embodiment described above, an isolatedcircuit is formed on both surfaces (a first and a second surface) in thethickness direction of the substrate, and the patient circuit and theground-side circuit are connected on both surfaces using asurface-mount-type impedance element; therefore, the flexibility ofselection and placement of the impedance element can be enhanced.

Furthermore, in the Modification Example 3, since a surface-mount-typeimpedance element is used, the number of manufacturing steps of thesubstrate can be made smaller than in the case of using a DIP-typeimpedance element.

It is also possible to employ a configuration in which one isolatedcircuit is provided so as to be exposed on both surfaces of theinsulating layer and an impedance element is connected to the isolatedcircuit on both surface sides.

Modification Example 4

FIG. 6 is a cross-sectional view showing the configuration of a mainpart of a substrate according to Modification Example 4 of theembodiment. A substrate 16 shown in the drawing includes patientcircuits 17 a, 17 b, 17 c, and 17 d, ground-side circuits 18 a, 18 b, 18c, and 18 d, insulating layers 19 a, 19 b, 19 c, and 19 d, and isolatedcircuits 44 a, 44 b, 44 c, and 44 d.

On the surface of the insulating layer 19 a, the patient circuit 17 a,the ground-side circuit 18 a, and the isolated circuit 44 a are providedapart from each other. The patient circuit 17 a and the isolated circuit44 a are connected via an impedance element 69. The ground-side circuit18 a and the isolated circuit 44 a are connected via an impedanceelement 70.

On the surface of the insulating layer 19 b, the patient circuit 17 b,the ground-side circuit 18 b, and the isolated circuit 44 b are providedapart from each other. The patient circuit 17 b and the isolated circuit44 b are connected via an impedance element 71. The ground-side circuit18 b and the isolated circuit 44 b are connected via an impedanceelement 72. The insulating layer 19 a is stacked on the surfaces of thepatient circuit 17 b, the ground-side circuit 18 b, the isolated circuit44 b, and the impedance elements 71 and 72. In other words, the patientcircuit 17 a, the ground-side circuit 18 a, the isolated circuit 44 a,and the impedance elements 69 and 70 are provided to be stacked on onesurface of the insulating layer 19 a, and the patient circuit 17 b, theground-side circuit 18 b, the isolated circuit 44 b, and the impedanceelements 71 and 72 are provided to be stacked on the other surface ofthe insulating layer 19 a.

On the surface of the insulating layer 19 c, the patient circuit 17 c,the ground-side circuit 18 c, and the isolated circuit 44 c are providedapart from each other. The patient circuit 17 c and the isolated circuit44 c are connected via an impedance element 73. The ground-side circuit18 c and the isolated circuit 44 c are connected via an impedanceelement 74. The insulating layer 19 b is stacked on the surfaces of thepatient circuit 17 c, the ground-side circuit 18 c, the isolated circuit44 c, and the impedance elements 73 and 74. In other words, the patientcircuit 17 b, the ground-side circuit 18 b, the isolated circuit 44 b,and the impedance elements 71 and 72 are provided to be stacked on onesurface of the insulating layer 19 b, and the patient circuit 17 c, theground-side circuit 18 c, the isolated circuit 44 c, and the impedanceelements 73 and 74 are provided to be stacked on the other surface ofthe insulating layer 19 b.

The impedance elements 69 and 70 are located on one surface (a firstsurface) of the substrate 16, and impedance elements 75 and 76 arelocated on the other surface (a second surface) of the substrate 16. Theimpedance elements 71 to 74 are located on the inner layer of thesubstrate 16. The impedance elements 69 to 75 are provided such that atleast part of them overlap along the stacking direction of the substrate16 (the thickness direction of the substrate 16).

In Modification Example 4 of the embodiment described above, an isolatedcircuit is formed on both surfaces and each inner layer of thesubstrate, and the patient circuit and the ground-side circuit areconnected using a chip-type impedance element; therefore, an isolatedcircuit and an impedance element can be provided for each of a pluralityof pairs of a patient circuit and a ground-side circuit efficiently, andthe flexibility of placement of the patient circuit, the ground-sidecircuit, the isolated circuit, and the impedance element can beenhanced.

Furthermore, in the Modification Example 4, since a chip-type impedanceelement is used, there is no need to cause a connection terminal topenetrate through the substrate like in a DIP-type impedance element,and the impedance element can be located arbitrarily on at least any twoof the first and second surfaces and the inner layer; therefore, theflexibility of placement of the impedance element can be enhanced.

In the Modification Example 4, the isolated circuit may be provided onlyon the necessary layer or surface.

Modification Example 5

FIG. 7 is a plan view showing the configuration of a main part of asubstrate according to Modification Example 5 of the embodiment. Asubstrate 90 shown in the drawing includes a patient circuit 91, aground-side circuit 92, and an insulating layer 93 provided between thepatient circuit 91 and the ground-side circuit 92. On the surface of theinsulating layer 93, two isolated circuits 45 and 46 are formed side byside in a state of being apart from each other along the width direction(the left and right direction of the drawing) and being apart from thepatient circuit 91 and the ground-side circuit 92.

The isolated circuit 45 is connected to the patient circuit 91 via animpedance element 77. The isolated circuit 45 is connected to theisolated circuit 46 via an impedance element 78. The isolated circuit 46is connected to the ground-side circuit 92 via an impedance element 79.

In Modification Example 5 of the embodiment described above, since thepatient circuit and the ground-side circuit are connected using aplurality of isolated circuits and a plurality of impedance elements,there is no need to increase the size of the impedance element, and aplurality of small-sized impedance elements can be connected in series.Thus, the range of selection of the impedance element can be expanded.

The number of isolated circuits arranged in the width direction of theinsulating layer may be altered in accordance with conditions such asthe width of the insulating layer and the size of the impedance elementas appropriate, and may be not less than the three described above.

Modification Example 6

FIG. 8 is a plan view showing the configuration of a main part of asubstrate according to Modification Example 6 of the embodiment. Asubstrate 101 shown in the drawing includes a patient circuit 102, aground-side circuit 103, and an insulating layer 104 provided betweenthe patient circuit 102 and the ground-side circuit 103. On the surfaceof the insulating layer 104, an isolated circuit 47 is provided in aposition apart from the patient circuit 102 and the ground-side circuit103.

No impedance element is connected to the isolated circuit 47. Even insuch a configuration, stray capacitance is present between the isolatedcircuit 47, and the patient circuit 102 and the ground-side circuit 103,and therefore similar effects to those in the case where the patientcircuit 102 and the ground-side circuit 103 are connected using animpedance element can be obtained.

Other Embodiments

Hereinabove, embodiments of the present disclosure are described; butthe present disclosure is not limited to the embodiments describedabove. For example, it is also possible to configure a substrate bycombining the configurations described in the embodiment andModification Examples 1 to 6 as appropriate.

Further, the shape and placement of the patient circuit and theground-side circuit described in the embodiment and ModificationExamples 1 and 2 are only examples, and other shapes and placements maybe employed.

Further, although in the embodiments described above the substrate 6etc. are described as one fixed to the control device 3, the substrate 6etc. may be provided in the interior of the endoscope 2 or the lightsource device 4. Among these cases, in the case where the substrate 6etc. are provided in the interior of the endoscope 2, it is preferablethat the length of the portion of the patient circuit be shorter.

Further, other than the impedance element and the IC for isolation, acircuit for sequence control may be provided as a circuit elementconnected to the isolated circuit, for example.

The present disclosure can be applied to all kinds of medical devicesthat are brought into contact with or inserted into a subject andperform the observation, treatment, etc. of the subject. Examples ofsuch a medical device include an ultrasonic diagnostic system usingultrasonic waves, a treatment equipment system that applies energy to asubject, an X-ray device using X-rays, etc. The present disclosure canbe applied more generally to any medical device at least part of whichcan be brought into contact with or inserted into a subject such as aperson and that includes a patient circuit and a ground-side circuit,regardless of whether it is for observation use or for treatment use.

FIG. 9 is a plan view showing the configuration of a substrate accordingto another embodiment. A substrate 201 shown in the drawing includes apatient circuit 202, three ground-side circuits 203 a, 203 b, and 203 c,and insulating layers 204 a, 204 b, and 204 c formed between the patientcircuit 202 and the ground-side circuits 203 a, 203 b, and 203 c,respectively. The major surface of the insulating layers 204 a and 204 bhas a hook-like shape. The major surface of the insulating layer 204 chas a straight-lined band shape.

The major surface of the substrate 201 has a rectangular shape, and thepatient circuit 202 having a T-shaped configuration is provided in acentral portion of the major surface. The ground-side circuits 203 a and203 b having a rectangular shape are provided individually on both sidesof the vertical line of the T shape of the patient circuit 202. Theground-side circuit 203 c having a rectangular shape in which the longside is equal in length to the horizontal line of the T shape isprovided in a position facing the horizontal line of the T shape of thepatient circuit 202. Any one of the ground-side circuits 203 a, 203 b,and 203 c is located in each of the four corners of the substrate 201.

In the vicinities of, among the vertices of the ground-side circuits 203a and 203 b, the vertices not connected to either of the insulatinglayers 204 a and 204 b, holes 231 a and 231 b through which a fixingscrew for fixing the substrate 201 to the casing of the control deviceincluded in the medical device is inserted are formed, respectively.Also in the vicinities of, among the vertices of the ground-side circuit203 c, the two vertices not connected to the insulating layer 204 c,holes 231 c and 232 c through which a fixing screw is inserted areformed, respectively. The ground-side circuits 203 a, 203 b, and 203 care protectively grounded via the fixing screw and the casing.

The patient circuit 202 and the ground-side circuits 203 a and 203 b areconnected via impedance elements 211 and 212, respectively. The patientcircuit 202 and the ground-side circuit 203 c are connected viaimpedance elements 213 and 214 and an IC for isolation 215.

The impedance elements 211 to 214 are located in edge end portions ofthe substrate 201. Therefore, the reference potential of the patientcircuit 202 can be stabilized by the substrate 201.

Additionally, the present technology may also be configured as below.

(1)

A substrate for a medical device configured to be included in a medicaldevice at least part of which is brought into contact with or insertedinto a subject,

the substrate for a medical device including:

a patient circuit that is a circuit on a side of being brought intocontact with or inserted into the subject;

a ground-side circuit that is a circuit configured to perform at leastone of transmission of a signal, reception of a signal, and supply ofelectric power on the patient circuit and grounded;

an insulating layer provided between the patient circuit and theground-side circuit and providing insulation between the patient circuitand the ground-side circuit; and

an isolated circuit provided apart from the patient circuit and theground-side circuit on the insulating layer and having a differentreference potential from the patient circuit and the ground-sidecircuit.

(2)

The substrate for a medical device according to (1), further including aplurality of impedance means for connecting either one of the patientcircuit and the ground-side circuit and the isolated circuit,

wherein the patient circuit and the ground-side circuit are connectedvia the isolated circuit and at least part of the plurality of impedancemeans.

(3)

The substrate for a medical device according to (2), wherein theisolated circuit and the impedance means are located on at least one ofa first surface and a second surface that are surfaces in a thicknessdirection of the substrate for a medical device and an inner layer.

(4)

The substrate for a medical device according to any one of (1) to (3),further including:

a plurality of the isolated circuits; and

an impedance means for connecting two of the plurality of isolatedcircuits.

(5)

The substrate for a medical device according to any one of (2) to (4),wherein the impedance means is formed of a chip-type electroniccomponent.

(6)

The substrate for a medical device according to (5), wherein theimpedance means is located on at least two of a first surface and asecond surface that are surfaces in a thickness direction of thesubstrate for a medical device and an inner layer, and is provided suchthat at least part of the impedance means overlap along the thicknessdirection of the substrate for a medical device.

(7)

The substrate for a medical device according to any one of (1) to (6),including a conduction fixing portion provided in the ground-sidecircuit and fixed in the medical device while being connected withconduction to a ground-side circuit or a grounding unit provided in themedical device and yet outside the substrate for a medical device.

(8)

A medical device including the substrate for a medical device accordingto any one of (1) to (7).

(9)

The medical device according to (8), including:

a tip device including a circuit unit connected with conduction to thepatient circuit and being configured to be brought into contact with orinserted into the subject; and

a control device including the substrate for a medical device and beingconfigured to control operation of the tip device.

(10)

The medical device according to (8) or (9), further including anelectrically conductive fixing means for fixing the substrate for amedical device in the medical device,

wherein the ground-side circuit is grounded via the fixing means.

REFERENCE SIGNS LIST

-   1 endoscope system-   2 endoscope-   3 control device-   4 light source device-   5 display device-   6, 10, 11, 12, 16, 90, 101 substrate-   7, 13, 17 a, 17 b, 17 c, 17 d, 91, 102 patient circuit-   8 a, 8 b, 8 c, 14, 18 a, 18 b, 18 c, 18 d, 92, 103 ground-side    circuit-   9 a, 9 b, 9 c, 15, 19 a, 19 b, 19 c, 19 d, 93, 104 insulating layer-   31 to 43, 44 a, 44 b, 44 c, 44 d, 45 to 47 isolated circuit-   51 to 79 impedance element-   59, 60 IC for isolation-   81 a, 81 b, 81 c, 82 c hole

The invention claimed is:
 1. A substrate for a medical device configuredto be included in the medical device, a portion of which is brought intocontact with or inserted into a subject, the substrate for the medicaldevice comprising: a patient circuit that is conductively connected tothe portion of the medical device that is configured to be brought intocontact with or inserted into the subject; a ground-side circuit that isa circuit configured to perform at least one of transmission of asignal, reception of a signal, and supply of electric power on thepatient circuit, the ground-side circuit being grounded by a protectiveground to ensure safety of a manipulator of the medical device; aninsulating layer provided between the patient circuit and theground-side circuit and providing insulation between the patient circuitand the ground-side circuit; an isolated circuit provided apart from thepatient circuit and the ground-side circuit on the insulating layer andhaving a different reference potential from the patient circuit and theground-side circuit; and a first impedance circuit that connects thepatient circuit to the isolated circuit, and a second impedance circuitthat connects the ground-side circuit to the isolated circuit, at leastone of the first and second impedance circuits being formed of achip-type surface mount electronic component.
 2. The substrate for themedical device according to claim 1, further comprising a plurality ofimpedance means for connecting either one of the patient circuit and theground-side circuit and the isolated circuit, wherein the patientcircuit and the ground-side circuit are connected via the isolatedcircuit and at least part of the plurality of impedance means.
 3. Thesubstrate for the medical device according to claim 2, wherein theisolated circuit and the impedance means are located on at least one ofa first surface and a second surface that are inner layers of surfacesin a thickness direction of the substrate for the medical device.
 4. Thesubstrate for the medical device according to claim 2, wherein theimpedance means is formed of a chip-type electronic component.
 5. Thesubstrate for the medical device according to claim 4, wherein theimpedance means is located on at least two of a first surface and asecond surface that are inner layers of surfaces in a thicknessdirection of the substrate for the medical device, and is provided suchthat at least part of the impedance means overlap along the thicknessdirection of the substrate for the medical device.
 6. The medical deviceaccording to claim 2, wherein the impedance means includes a dielectricsheet.
 7. The substrate for the medical device according to claim 1,further comprising: a plurality of the isolated circuits; and animpedance means for connecting two of the plurality of isolatedcircuits.
 8. The substrate for the medical device according to claim 1,comprising a conductor provided in the ground-side circuit and fixed inthe medical device while being conductively connected to a ground-sidecircuit or a grounding unit provided in the medical device and yetoutside the substrate for the medical device.
 9. The medical deviceaccording to claim 1, wherein the isolated circuit is placed at aposition where stray capacitance occurs between the patient circuit andthe ground-side circuit.
 10. The medical device according to claim 1,wherein the patient circuit and the ground-side circuit are arranged ona same layer in a thickness direction of the substrate.
 11. Thesubstrate for the medical device according to claim 1, wherein theisolated circuit and the first and second impedance circuits are locatedon at least one of a first surface and a second surface that are innerlayers of surfaces in a thickness direction of the substrate for themedical device.
 12. The substrate for the medical device according toclaim 1, further comprising: a plurality of the isolated circuits; andan impedance circuit configured to provide a predetermined impedance forconnecting two of the plurality of isolated circuits.
 13. The substratefor the medical device according to claim 1, wherein each of the firstimpedance circuit and the second impedance circuit is formed of achip-type surface mount electronic component.
 14. The substrate for themedical device according to claim 13, wherein the at least one of thefirst impedance circuit and the second impedance circuit is located onat least two of a first surface and a second surface that are innerlayers of surfaces in a thickness direction of the substrate for themedical device, and is provided such that at least part of the first andsecond impedance circuits overlap in the thickness direction of thesubstrate for the medical device.
 15. The medical device according toclaim 1, wherein at least one of the first impedance circuit and thesecond impedance circuit includes a dielectric sheet.
 16. The substratefor the medical device according to claim 1, wherein the first andsecond impedance circuits are arranged to overlap the insulating layer,the first impedance circuit connects the patient circuit to the isolatedcircuit across the insulating layer, and the second impedance circuitconnects the ground-side circuit to the isolated circuit across theinsulating layer.
 17. The substrate for the medical device according toclaim 1, wherein the patient circuit and the ground-side circuit includea plurality of surface-mount type electronic components.
 18. Thesubstrate for the medical device according to claim 1, wherein the firstand second impedance circuits include at least one of a capacitor, acoil, and a resistance.
 19. The substrate for the medical deviceaccording to claim 1, wherein the first impedance circuit and the secondimpedance circuit are arranged on a same layer in a thickness directionof the substrate.
 20. A medical device, a portion of which is broughtinto contact with or inserted into a subject, the medical devicecomprising a substrate for the medical device, wherein the substrate forthe medical device includes a patient circuit that is conductivelyconnected to the portion of the medical device that is configured to bebrought into contact with or inserted into the subject, a ground-sidecircuit that is a circuit configured to perform at least one oftransmission of a signal, reception of a signal, and supply of electricpower on the patient circuit, the ground-side circuit being grounded bya protective ground to ensure safety of a manipulator of the medicaldevice an insulating layer provided between the patient circuit and theground-side circuit and providing insulation between the patient circuitand the ground-side circuit, an isolated circuit provided apart from thepatient circuit and the ground-side circuit on the insulating layer andhaving a different reference potential from the patient circuit and theground-side circuit, and a first impedance circuit that connects thepatient circuit to the isolated circuit, and a second impedance circuitthat connects the around-side circuit to the isolated circuit, at leastone of the first and second impedance circuits being formed of achip-type surface mount electronic component.
 21. The medical deviceaccording to claim 20, comprising: a tip device including a circuit unitconductively connected to the patient circuit and being configured to bebrought into contact with or inserted into the subject; and a controldevice including the substrate for the medical device and beingconfigured to control operation of the tip device.
 22. The medicaldevice according to claim 20, further comprising an electricallyconductive fixing means for fixing the substrate for the medical devicein the medical device, wherein the ground-side circuit is grounded viathe fixing means.
 23. The medical device according to claim 20,comprising: a tip circuit conductively connected to the patient circuitand being configured to be brought into contact with or inserted intothe subject; and a control processing circuit including the substratefor the medical device and being configured to control operation of thetip circuit.
 24. The medical device according to claim 20, furthercomprising an electrically conductive fastener for fixing the substratefor the medical device in the medical device, wherein the ground-sidecircuit is grounded via the electrically conductive fastener.